from The Century Dictionary and Cyclopedia
- n. A direct-acting hammer where the hammer-block is lifted vertically, either by cams or friction-rollers, or, as is more commonly the case, by steam- or water-pressure acting on a piston in a closed cylinder.
Sorry, no etymologies found.
I have set Webb to work to try it with the little engine and a stamp-hammer of 60 lbs. weight.